RPCScan is a Windows based application designed to quickly and accurately identify vulnerable Windows operating systems. The RPCScan application is designed to allow users to quickly identify whether or not operating systems are vulnerable to the multiple buffer overflow vulnerabilities released in the MS03-026 and MS03-039 bulletins. This utility has been developed with the intent of performing more reliably than the existing Active Directory and DCOM discovery capabilities currently available on the Internet.
The RPCScan application is a passive system that will be deployed in production environments during production hours.
Microsoft has released a security bulletin detailing multiple buffer overflow vulnerabilities in Microsoft RPCSS (Remote Procedure Call Security Support) server that handle the message callbacks for DCOM communication.
Two of the vulnerabilities can result in remote, unauthorized, arbitrary code execution, and the third can result in a local denial-of-service condition. These vulnerabilities can be triggered by communicating with Microsoft RPCSS servers where the clients are running the Windows operating systems that were released as part of the MS03-026 and MS03-039 bulletins.
There are two distinct attack vectors that are possible to exploit these vulnerabilities.

Exploit vector 1:

This vulnerability can be exploited by making a RCP call to the RPCSS service. RPC calls can be made through the DCOM interface as a method of implementing the DCOM activation and de-activation events.
In the event that the RPCSS service is not running on the target machine, the RPC call will be rejected, so client side filtering is not required in this exploit vector.
The attack requires that the DCOM environment has been built with RPCSS enabled. It can be determined if RPCSS is enabled by the presence of the RPCSS.dll, RPCSSDS.dll, RPCSSTS.SYS, and RPCSSDSM.SYS service objects.
In this exploit vector, RPCSSDS.dll is located at \\DIMENSIONS\\system\\install\\rpcrt40\\srv\\rpssdm.dll (Win32)
MS03-026 bulletins:
Vuln #3 – RPCSS Environment Check

Exploit vector 2:

In this exploit vector, a valid DCOM file is transmitted in a RCP call to the RPCSS service. When the RPCSS service checks the validity of the target file, it will attempt to read the first 1,048,576 bytes of the file and will not attempt to read past this point. If

RPCScan is a small utility designed to passively detect and identify at-risk systems running unpatched versions of Windows 2000 and Windows XP operating systems. If an unpatched computer is connected to your network, RPCScan can use the DCOM protocol to detect it, and identify the version of Windows it is running. Additionally, RPCScan can identify the specific vulnerability that is present within the RPCSS service.
The RPCScan feature is not intrusive and is meant to be installed as a utility application. This means that it does not modify the registry, nor does it change any user or system files.
RPCScan Features:
A Passive Passive Scanner based on the DCOM protocol allows RPCScan to be used on computers and servers across a network and can identify at-risk computers, even if these computers are not directly visible to the scanning host.
If the targeted system is a Microsoft operating system that is potentially vulnerable to the MS03-026 or MS03-039 bulletins, RPCScan can identify the target operating system version and report the vulnerable versions of the RPCSS service.
RPCScan is installed as an add-on application. This means that all files and registry entries that RPCScan creates or modifies must be moved to their final destination by the system administrator, or they will be erased. RPCScan is not a destructive tool and files that it creates are automatically deleted upon close.
RPCScan runs as a background application, so it will not cause any problems for the operating system or any programs that are running during its operation. However, RPCScan modifies the RPCSS service registry, so if any other malicious software is running on the same system that is affected by the vulnerability and is not shut down or removed before RPCScan is installed, the malicious software will be overwritten and RPCScan will not function properly. RPCScan may interfere with potentially destructive program installations. RPCScan will not interfere with any system backup utilities.
RPCScan may make false positive calls for some versions of Windows, such as Windows 98, Windows NT4 and Windows 2000 and Windows XP. RPCScan was designed to be a robust tool, but it is not perfectly compatible with all versions of Windows. Every call that RPCScan makes to Windows is made through a native Windows API call, so RPCScan is not affected by issues that can occur in native Windows API code.
RPCScan may make false positive calls for Microsoft operating systems that are being patched and have performed a reboot, such as Windows 2000 and Windows
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The RPCScan DCOM RCP message handler and RPCScan DCOM RCP handler combats these vulnerabilities in two fundamental ways:

Intercepts DCOM interface calls and blocks them if they are malformed.

Inspects and blocks malformed calls from being made.

RPCScan can detect the presence of an MS03-039 or MS03-026 bulletin and can detect a range of reported vulnerabilities for operating systems where MS03-026 is not the primary bulletin. The range of vulnerabilities also include MS03-052, MS03-051, MS03-034, MS03-039, and MS03-046.

The vulnerability is detected by first determining which versions of the DCOM component [i.e., the Remote Procedure Call (RPC) service] are installed on the system. The RPC service controls the DCOM model object activation request interface calls, and RPCScan checks for the possible presence of a version of the RPC service that is vulnerable to the MS03-026 and MS03-039 bulletins. It then runs a number of tests to determine if the RPC service in question has a specific vulnerability.

The first vulnerability is identified by comparing the lengths of “lpnCount” and “dwndrvcnt.” If the length of either of these two fields are unequal, then the RPC service may have a potential vulnerability.

The second vulnerability is detected by comparing the length of the “lpwstrct” and “pwstrct” fields. If the length of either of these two fields are unequal, then the RPC service may have a potential vulnerability.

The third vulnerability is identified by parsing the “lpip” and “pip” strings, and examining the physical context of the code to determine if it may trigger a buffer overrun.

RPCScan has some interesting behaviors when confronted with malformed RPC messages. If the “lpIds” and “lpwstrct” fields contain more than 2 items, RPCScan blocks the activation request. RPCScan also checks the lengths of “lpwstrct” and “pwstrct” for more than 2 items.

The “lpnCnt” field is unique to MS03-039, and all systems using a vulnerable RPC service must also contain this item. MS03-052 is the only

The RPCScan utility is able to detect vulnerable Microsoft Windows PCs by searching the global multicast address of 224.0.0.1 for the presence of RPCSS network stack listening on port 135 for messages that are sent out from a vulnerable host, and matching these messages with the vulnerable DCOM object activation requests.
If an RPCSS listener is detected, the remote socket is analyzed to search for DCOM objects within the listening socket’s address range. If one of these DCOM objects contains a buffer overflow, RPCScan will send out a request to the object manager to perform a vulnerability scan of the target. If vulnerability is detected in the target, RPCScan generates a short text report describing the vulnerable object.
RPCScan is a simple utility that tries to stay out of your way. It provides the requisite data and methodologies needed to perform a rapid search for instances of vulnerable operating systems.
RPCScan is not a “passive tool”, in that it will actively search for the presence of RPCSS servers on the network.
RPCScan detects only those operating systems that have the ability to respond to RPCSS requests from other hosts, and only those that have implemented the RPCSS service.
RPCScan is designed to be run on Windows 2000 and later operating systems, and is able to analyze Windows XP and Windows 2000 Professional installations, as well as Windows 2000 Server and Windows Server 2003.
If the DCOM protocol is not enabled on the operating system, RPCScan will not detect the vulnerable objects.
RPCScan will always check for the RPCSS service running on the network interface that is being configured. If RPCScan is not configured to use the network interface that the service is listening on, the RPCScan program will not detect anything and will simply exit.
RPCScan can optionally be disabled by removing the RPCScan executable from the start-up folder.
If multiple RPCScan processes are started on the same machine, the results from each will be saved to separate log files. RPCScan will only continue to run after the first RPCSS listener detected finishes its scan.
Synopsis:
RPCScan -ActiveAddresses
This command starts the scan, and RPCScan will use that interface to search for vulnerable DCOM objects. The interface must be enabled on the host in question, and RPCScan will attempt to determine it, as described in the Interface Listing section below.
RPCScan -ScanAddress
This command starts the scan, using the specified address range as the listening interface.

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OS: Windows 10, 8.1, 8, 7, Vista, XP
Processor: Intel Pentium or equivalent Dual-Core or Quad-Core
RAM: 2GB RAM
HDD: 2GB space
Source
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